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Derivative and Hedging Activities - Effect of Cash Flow Derivative Instruments on AOCL (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Amount of gain (loss) recognized in AOCL $ 2 $ 59
Amount of gain (loss) reclassified from AOCL to interest expense $ 18 $ 6